Reflexes

Question 1

what are reflexes

Answer 1

they are involuntary actions - preventing overloading of the brain. They are also innate, providing that immediate protection. They are also very fast

Question 2

what is the reflex arc structure

Answer 2

There is the receptor that receives the stimulus. This signal gets sent through the sensory neurone. It will then release neurotransmitters that continues the AP through the relay neurone and then the same process to the motor neurone that sends the signal to the effectors

Question 3

what is the knee jerk reflex

Answer 3

Tap under kneecap causes patellar to stretch. This stretches extensor. This sends reflex arc impulse through sensory neurone. Reflex signal goes along one motor neuron, causing extensor to contract. Relay neuron inhibits the other motor neuron of flexor muscle to relax. This causes leg to kick out antagonistically

Question 4

what is the knee jerk reaction an example of

Answer 4

spinal reflex as it involves the spinal chord

Question 5

what is the blinking reflex used for

Answer 5

to see if unconscious patients are brain dead

Question 6

what type of reflex is blinking reflex

Answer 6

cranial reflex as it involves the brain not the spinal chord

Question 7

what happens if you are brain dead

Answer 7

the relay neurone in the lower brain stem does not work and the blinking reflex will not work

Question 8

how to test brain dead

Answer 8

touch cornea or shine bright light

Question 9

hwo does the blink reflex occur

Answer 9

cornea irritated - triggers impulse along sensory neurones - to the lower brain stem where the relay neuron is to carry on the impulse - signal branches off in motor neurone to eyelid muscles - both eyes shut as a consensual response